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Search: id:A109771
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| 1, 3, -4, 12, -44, 180, -788, 3612, -17116, 83172, -412196, 2075436, -10586892, 54595476, -284157492, 1490774076, -7875206076, 41854313412, -223636052036, 1200637707852, -6473448634348, 35037238641780, -190299310403924, 1036863750837852, -5665846701859484
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OFFSET
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0,2
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COMMENT
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G.f. = square root of weight enumerator of [4,3,2] even weight code.
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LINKS
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N. Heninger, E. M. Rains and N. J. A. Sloane, On the Integrality of n-th Roots of Generating Functions, J. Combinatorial Theory, Series A, 113 (2006), 1732-1745.
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EXAMPLE
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1+3*x-4*x^2+12*x^3-44*x^4+180*x^5-788*x^6+3612*x^7-...
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CROSSREFS
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Sequence in context: A000208 A079154 A101716 this_sequence A052626 A122903 A059792
Adjacent sequences: A109768 A109769 A109770 this_sequence A109772 A109773 A109774
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KEYWORD
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sign
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AUTHOR
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njas and Nadia Heninger (nadiah(AT)cs.princeton.edu), Aug 13 2005
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